{
  "features": [
    {
      "root": {
        "$source": "a/b",
        "e": "$${xpath('../b/c/d/e')}",
        "nested": {
          "$source": "c/d",
          "d": "$${xpath('../b/c/d')}",
          "nested2": {
            "$source": "e",
            "f": "$${xpath('../../b/e/f')}",
            "g": "${e/f/g}"
          }
        }
      }
    }
  ]
}